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Surface-step-induced magnetic anisotropy of p(1×1) Fe on W(100) (2001)

Mireles, Hector C. ; Erskine, J. L.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 6671-6673

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Magneto-optic Kerr effect measurements of ultrathin p(1×1) Fe films on graded-step-density W(100) are used to study step-induced magnetic anisotropy. Spot-profile-analysis low-energy-electron diffraction is used to characterize the stepped W(100) surface prior to film growth and the epitaxial Fe layer after vapor deposition. The experimental results are qualitatively compatible with prior experiments and with theoretical predictions based on the Néel model and on a one-dimensional micromagnetic model proposed by Hyman, Zangwell, and Stiles (HZS). The observed evolution of hysteresis loop shape as a function of step density and anisotropy strength (which was varied by chemisorption of oxygen) is observed to be consistent with a hysteresis loop phase diagram based on the HZS model. However, the measured variation of switching field versus vicinal angle α for 2 monolayer thick Fe films differs significantly from the quadratic dependence predicted by the Néel model and from the dependence predicted by HZS. The surface-step-induced anisotropy vanishes at high vicinality (α∼10°) and novel two-state switching is observed at specific vicinal angles. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1355319

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Digitale Medien

Multichannel detection high-resolution electron energy loss spectrometer (1989)

Jeong, Eue-Jin ; Erskine, J. L.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 60 (1989), S. 3139-3150

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A new general-purpose high-resolution electron energy loss spectrometer has been constructed and tested. Novel features of the electron optics include multichannel energy detection and tandem four-element zoom lenses that incorporate beam defining apertures. Compact design of the lenses permit scattering measurements in which the total scattering angle is less than 40°. This feature permits probing bulk phonon modes. The lens system permits electronic adjustment of the analyzer collection angle, and yields high transmission at retardation/acceleration ratios of 400:1. Performance characteristics include simultaneous detection of 50 energy channels at 4-meV energy resolution and target currents exceeding 2×10−10 A. Separate monochromator and analyzer goniometers permit access to out-of-plane scattering configurations which enables probing odd symmetry shear surface modes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1140545

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High-speed high spatial resolution magneto-optic Kerr effect polarimeter/microscope for studies of ultrathin magnetic structures (2000)

Heidkamp, Marcus ; Erskine, J. L.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 71 (2000), S. 3141-3147

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A magneto-optic Kerr effect polarimeter designed to study the dynamics of magnetization reversal in ultrathin films, multilayer films, and microstructures is described. The polarimeter is integrated into a long focal-length charge coupled device (CCD) camera based Kerr microscope that permits viewing domain structures and facilitates positioning of the focused polarimeter beam on microstructures in ultrahigh vacuum. Diffraction-limited spatial resolution, based on the f-number of the respective objective lenses, is achieved by the microscope (∼1 μm) and polarimeter (∼5 μm). The polarimeter is capable of measuring continuous wave or repetitive transient ultrathin film magnetic response at sampling rates of 40 million samples/s (MS/s) over a micron-scale region defined by the illuminating spot. Hysteresis loops generated by ultrathin (monolayer) films and microstructures can be measured at high signal-to-noise ratio over a nine-decade range of drive frequencies. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1304864

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Exploring magnetic properties of ultrathin epitaxial magnetic structures using magneto-optical techniques (1989)

Ballentine, C. A. ; Fink, R. L. ; Araya-Pochet, J. ; [weitere]

Springer

Applied physics 49 (1989), S. 459-466

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ISSN: 1432-0630

Schlagwort(e): 75.30.Gw ; 75.70.Ak ; 75.40.Cx

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract We describe magneto-optic Kerr effect studies of ultrathin Fe and Ni films on single crystal surfaces of Ag and Cu. Monolayer Fe films on Ag(100) exhibit the theoretically predicted spin-orbit anisotropy, but also yield some interesting discrepancies between behavior predicted by Kerr effect and by spin-polarized photoemission experiments. Layer-dependent studies of the magnetic moment of Ni on Ag(111) and Ag(100) suggest sp-d hybridization effects quench the first layer magnetic moment on Ag(111) but not on Ag(100). Temperature dependent studies of thin film magnetization obtained from Kerr effect measurements yield thickness dependent Curie temperatures, and critical exponents for several thin film systems.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00617012

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